STEPS TO REPRODUCE 1. Pin a bunch of apps to the Task Manager 2. Launch a few of them 3. Drag any of the pinned-and-running apps to re-arrange them OBSERVED RESULT You can't. EXPECTED RESULT You can. ADDITIONAL INFORMATION You can re-arrange pinned apps that are not running, and running apps that are not pinned, but not apps that have both characteristics.
Cannot reproduce on Plasma 5.27.6, X11, Qt 5.15.3, Kubuntu 22.04 LTS using the Breeze Dark theme and a floating panel. I can drag pinned apps (both launched and non-launched) freely.
Right, it's a recent Plasma 6 regression.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/3129
Git commit b9ffae96de16dbbc5ccde6c1324573aba2f06cad by Fushan Wen. Committed on 31/07/2023 at 16:12. Pushed by fusionfuture into branch 'master'. libtaskmanager: fix unable to change order of launchers Amends a67e3674bae276bf76a11df7e0d11c6195e591b8 Amends 097e896ccb960a33e4bc60721344e3529ccedf4b FIXED-IN: 5.27.7 M +2 -2 libtaskmanager/tasksmodel.cpp https://invent.kde.org/plasma/plasma-workspace/-/commit/b9ffae96de16dbbc5ccde6c1324573aba2f06cad
Git commit b1711a48ea745ba3eed189fc59726abf5b5fb050 by Fushan Wen. Committed on 31/07/2023 at 16:15. Pushed by fusionfuture into branch 'Plasma/5.27'. libtaskmanager: fix unable to change order of launchers Amends a67e3674bae276bf76a11df7e0d11c6195e591b8 Amends 097e896ccb960a33e4bc60721344e3529ccedf4b FIXED-IN: 5.27.7 (cherry picked from commit b9ffae96de16dbbc5ccde6c1324573aba2f06cad) M +2 -2 libtaskmanager/tasksmodel.cpp https://invent.kde.org/plasma/plasma-workspace/-/commit/b1711a48ea745ba3eed189fc59726abf5b5fb050